Furnace



H. B. KINNEAR AND A. J. TOWNSEND.

FURNACE.

APPLICATION FILED MAY 12, 1919.

1,339,564. Patented May 11, 1920.

2 SHEETS-SHEET I.

H. B. KINNEAR- AND A. J. TOWNSEND.

FURNACE. APPLICATION FILED. MAY 12, 1919.

1,339,564, Patented May 11, 1920.

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE.

HARRY B. KINNEAR, OF MASSILLON, AND AR'Tl-IUR J. TOWNSEND, 0F CANTON,OHIO.

FURNACE.

Specification of Letters Patent.

Patented May 11, 1920.

Application filed May 12, 1919. Serial No. 296,493.

The object of the invention is'to provide a furnace especially designedfor heating blanks for hot pressing and arranged to heat the blankswithin channels or chambers unconnected from the heating chamber of the.

furnace, thus keeping the articles to be heated out of contact with thegases in the heating chamber and preventing scaling or oxidizing of thearticles being heated.

A further object is the provision of a heating furnace of the charactermentionedrcomprising a receiving chamber and a: delivery chamberseparated from the heating chamin the weight of the articles within theWith these objects in view the invention consists in the novelconstruction and arrangement of parts, hereinafter described,illustrated in the accompanying drawings, and particularly pointed outin the appended claims, it being understood that various changes in theform, proportions, size and minor details of construction may be madewithin the scope of the, appended claims, without departing from thespirit or sacrificing any of the advantages of the invention.

The invention thus set forth in general terms is illustrated in theaccompanying drawings forming part hereof, in which-- Figure 1 is alongitudinal sectional view through a furnace embodying the invention;and

Fig. 2 a transverse sectional view through the same.

A practical embodiment of the invention is disclosed in the accompanyingdrawings,

forming a part of this specification in which similar numerals ofreference indicate corresponding parts throughout the several VIQWS.

The furnace comprises generally the fire box 1, a burner 2 being showntherein, the heating chamber 3 which is separated by walls from thereceiving chamber 1 and the delivery chamber 5, and vertically disposedtubes 6 passing upwardly through the heating chamber from the receivingchamber and forming communication between the receiving chamberand thedelivery chamber. Achecker work 7 is provided within the heating chamberforming a tortuous passage through which the heat passes around thetubes 6 from the fire box 1 to the stack 8.

It will be noted that the tubes 6 have no communication with the heatingchamber thus preventing the gases in the heating chamber from enteringthe tubes and coming into contact with the articles being heated withinthe tubes, while at the same time, the tubes being located entirelythrough the heating chamber and the heat passing back and forth throughthe checker work therein is carried entirely around all of the tubesheating them all evenly, the upper extremities of the tubes attainingthe highest temperature in the heating chamber as they receive the heatdirectly from the tire box while the. lower extremities of the tubes areonly heated to a less degree as they receive only the heat which haspassed through the tortuous passage formed by the checkerwork in theheating chamber.

A pair of diametrically opposed dogs 9 are slidably mounted through eachtube,

'of each tube is internally beveled at 13.

Located beneath, and in alinement with each tube is an elevator whichmay be in the. form of a fluid cylinder 14 connected by means of a pipe15 with any suitable source of fluid under compression, a piston 16being provided in the cylinder to elevate the blanks into the tube.

From the above description and an inspection of the accompanyingdrawings the operation of the furnace will be clearly understood. Theblanks to be heated are placed upon the pistons in small packs as shownat A. As each piston is raised the blanks carried thereon will engagethe beveled faces 12 upon the dogs in the adjacent tube, forcing saiddogs outwardly against their springs, as shown in the right hand tube inFig. 1. The piston will continue to move upwardly until all of theblanks carried thereby have been raised above the level of the dogs. Asthe piston descends the dogs will be forced into place beneath the lowerblank of the pack, sustaining the weight of the blanks within the tubeas shown in the drawings. With each operation of the piston, moving anew pack of blanks into the tube, the column of blanks within the tubeis raised within the tube. The blanks are thus brought into the lowerend of the tube which is at a comparatively low temperature and aremoved up through the tube through an increasing temperature and ejectedfrom the upper end of the tube into the delivery chamber 5 as shown at Bfrom which they are removed through the door 17.

Although the furnace is especially adapted for heating blanks for hotpressing, it will. be readily seen that it is applicable for any heatingor heat treating where it is desirable to keep the articles undertreatment from coming into contact with the gases within the heatingchamber, thus preventing scaling or oxidizing of the product. Thlsfurnace is especially eflicient in heating sheet bars and tin bars.

We claim:

1. A furnace including a heating chamber, a receiving chamber and adischarging chamber, a tube located entirel through the heating chamberand connecting the receiving chamber and discharge chamber and means forpassing articles to be heated upwardly through said tube.

2. A furnace including a heating chamher, a tube located entirelythrough said heating chamber and isolated therefrom, an elevator forpassing articles to be heated into the lower end of the tubeand springpressed dogs for supporting the articles within the tube.

3. A furnace including a heating chamber, a tube located entirelythrough said heating chamber and isolated therefrom, an elevator forpassing articles to be heated into the lower end of the tube and springpressed dogs provided with beveled faces and arranged to support thearticles within the tube.

4. A furnace including a heating chamber, a receiving chamber locatedbeneath and isolated from said heating chamber, a discharging chamberlocated above and isolated from the heating chamber, a plurality oftubes connecting the receiving chamber and discharge chamber and locatedthrough the heating chamber, and means for passing articles to beheated, upward through said tubes.

5. A furnace including a heating chamber, a receiving chamber locatedbeneath and isolated from said heating chamber, a discharging chamberlocated above and isolated from said heating chamber, a plurality oftubes connecting the receiving chamber and discharge chamber and locatedthrough the heating chamber and isolated therefrom, and means within thereceiving chamber for passing articles to be heated up through the tubesand into the discharging chamber.

In testimony that We'claim the above, we have hereunto subscribed ournames.

HARRY B. KINNEAR. ARTHUR J. TOWNSEND.

